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"I had a CT scan but nothing was picked up and my double vision, shortness of breath and the unbearable back pain were blamed on 'complex migraines'."

Amanda said if it had not have been for her mother, Jenny, insisting on an MRI scan, she would not be here today.

Amanda Day pictured after losing her hair as a result of her treatment for a brain tumour (Image: Amanda Day / SWNS)

The sixth-former from Sheppey, in Kent, said: "My mum remained adamant that my problems, which were increasingly debilitating and left me on the sofa for hours, days sometimes, were not caused by growing pains and migraines.

"When a doctor accused me of lying it was the final straw. It had got to the stage where I began to doubt myself.

"I could see how some people might have thought I was being a drama queen and perhaps faking it, but anyone who knew me would have understood this was not the case."